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English definition of “crystal”

crystal

noun
 
 
/ˈkrɪstəl/
ROCK [C, U] a type of transparent rockPrecious and semi-precious stonesTypes of rock
GLASS [U] a type of high quality glass: a crystal vaseGlass
SHAPE [C] a piece of a substance that has become solid, with a regular shape: ice crystalsGeometrical shapesSpherical, circular and annular objects
(Definition of crystal from the Cambridge Learners Dictionary © Cambridge University Press)
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